Glock values

I'll be heading to a local gun show next month to try & trade my 15 yr old Glock 19 w/aftermarket rear laser sight for a used Glock 34. can you tell me what a reasonable price for both my Glock 19 & a Glock 34 would be? thanks

15 year old G19 - $250 - $275 (wholesale - what the dealer will offer, maybe less if in less than average condition) Take the laser off if you can and transplant it. Dealer will give you no where near what you paid for it - in most cases they become a liability to the dealer - lots of people may want a used G19 - a small percentage want one with a used laser.
Lightly used G34 - $450 - 500 (retail - what the dealer will have on his tag)
Be prepared to haggle and negotiate a bit - that's the fun part of gun shows, at least for me.